P:F ratio: Difference between revisions
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imported>Robert Badgett (New page: :<math>{P/F\ ratio} = \left (\frac{PaO_2}{Fi0_2}\right) \times 100</math> An example in a healthy person: :<math>{476} = \left (\frac{100\ mm\ Hg}{21%}\right) \times 100</math> A high...) |
imported>Robert Badgett |
Revision as of 05:04, 3 April 2010
An example in a healthy person:
A higher ratio indicates better gas exchange:
- Normal is 500
- ARDS is < 200
Comparative studies suggest this measure correlates better with pulmonary shunts than does the A-a gradient.[1][2][3]
References
- ↑ Covelli HD, Nessan VJ, Tuttle WK (1983). "Oxygen derived variables in acute respiratory failure". Crit. Care Med. 11 (8): 646–9. PMID 6409506. [e]
- ↑ El-Khatib MF, Jamaleddine GW (2004). "A new oxygenation index for reflecting intrapulmonary shunting in patients undergoing open-heart surgery". Chest 125 (2): 592–6. PMID 14769743. [e]
- ↑ Cane RD, Shapiro BA, Templin R, Walther K (1988). "Unreliability of oxygen tension-based indices in reflecting intrapulmonary shunting in critically ill patients". Crit. Care Med. 16 (12): 1243–5. PMID 3191742. [e]